| Rating | Solver | Clue |
|---|---|---|
| EXACTING | Strenuous | |
| ARDUOUS | Strenuous | |
| STRUGGLE | Strenuous effort | |
| OVEREXERT | Be too strenuous | |
| EXERT | Make a strenuous effort | |
| ELBOWGREASE | The sort of joint lubrication needed for strenuous polishing? | |
| STRENUOUS | Eagerly pressing or urgent; zealous; ardent; earnest; bold; valiant; intrepid; as, a strenuous advocate for national rights; a strenuous reformer; a strenuous defender of his country. | |
| EFFORT | ...l or mental, in performing an act or aiming at an object; more or less strenuous endeavor; struggle directed to the accomplishment of an obje... | |